Medicago AB Products Are Available Worldwide. For Research Use Only. Vicia ervilia lectin (VEA) is isolated from bitter vetch seeds and has a molecular weight of 53 kDa. This lectin is blood group non-specific with sugar specificity for α-mannose and to a lesser extent, α-glucose residues. Agglutination is inhibited by mannose, glucose, fructose, methyl mannoside, maltose, melezitose and α, α’-trehalose. VEA is supplied without preservatives as a yellow lyophilized powder. For laboratory use only.